>>3763987 (OP)In this case, because:
1. They let you boost it to max with a skill (or reaction).
2. This skill has no built in cap to it's use, other than the stat cap.
3. There is no cost besides opportunities to using it (MP, CT, Brave if using the reaction).
4. It's also a damage stat in some cases.
Solution:
1. Limit stat boosts to: (base stat - gear bonuses) * 3 / 2, or maybe 5 / 4
2. Limit stat boosts for Yell, Scream, and the dragon only version to half that.
3. Give #2 MP costs, possibly CTs too.
4. Increase JP costs for above, and consider removing the ones that boost multiple stats.
5. Reduce how much SP is used as a damage stat, to 1/2 it's current value... Maybe. Some (SP + MA) * WP weapons would be nice. Throw is broken though, but I could change it to use the thrown weapon's formula instead.
6. Give each job unique and useful stat growths and multipliers so you have a reason to level up in them.